Parse Index List

vector<vector<int>> parseIndexList(vector<string> &strIndexList){
    vector<vector<int>> result;

    for ( auto s : strIndexList){
        int row = stoi(s.substr(0, s.find(" ")));
        int col = stoi(s.substr(s.find(" ")+1));
        result.push_back({row,col});
    }
    return result;
}